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psi for aboveground pool

I need to know what the psi is suppose to read when vaccuming an above ground pool. I have a sand filter and the guage reads 8 psi when circulating but drops to 1 when i start to vaccum. Is this normal?troublefreepool.com

He is no fool who gives up what he cannot keep to gain what he cannot lose....

My psi sits around 14-16 on average and drops BY around 2 psi when I vac UNLESS there is something blocking it - follow the line from the end: check the vac head, the hose, the skimmer port/basket and then the pump basket itself. A small twig or big leaf can cause everything to back up from there.